I do have to agree that it is indeed a gray area. But when it really comes down to it is it pay to win? Taking a look at how just because you purchase a weapon doesn't mean it makes you better or will make you automatically win. Black-market weapons bring an ID for new tactics to be brought to the table but as a person that uses the paid weapons, I find myself being beaten size of standard weapons more often than not. The benefit that one would get by having a paid weapon is severely outweighed by someone who has better skill. There's so many factors in what gets the win that saying the game is pay to win it's quite ignorant.
These factors include but definitely aren't limited to lag, scale by itself, teammates, location, and spawn location.